Feed to player 2 who defensive digs the ball to player 1 to set to player 2, who smashes the ball to player 3 who defensive digs the ball to player 2 to set to player 3.
For defensive dig: Keep knees bent and legs just wider than shoulder width apart. Eyes on the ball to the point of contact with wrists, ensuring wrists are together. Keep head level with the ball at point of contact and ensure power through the arms to get the ball over the net.
For set: Eyes up looking at ball trajectory and keep knees bent. Stand on the balls of your feet, bending the elbows and pushing through the ball with fingers at point of contact.
For smash: Eyes on the ball, other arm used as a guide. Player leans slightly back prior to contact with the ball. Upon contact, push body weight forward to generate power through the shot. Stay tall on balls of your feet and keep knees bent.
New hitters rarely miss because of their arm. They miss because of their feet. Build a reliable approach, then time it with your setter.
When your hitter gets stuffed, five teammates standing and watching is how you lose the point. Good attack coverage turns a blocked ball into a second swing.
Coaches spend hours correcting arms in serve receive when the real fault is almost always the feet. Fix the movement and the platform fixes itself.